关于洛必达法则证明的几点补充

Several supplements to demonstration of the L'Hospital Rule

用洛必达法则求函数的极限是一种很重要的方法。同济大学数学系主编的《高等数学》第六版教材中给出了洛必达法则的简单证明,本文对洛必达法则的证明作了详细的补充,以便于学生自学。

Using the L＇ Hospital Rule to compute functional limit is an important method. However, many beginners put in doubt on demonstrations of the L＇ Hospital Rule, which provided by the sixth edition textbook Higher Mathematics edited by the Department of Mathematics of Tongji University. In order to help them better understand the demonstrations of the L＇ Hospital Rule, the paper presents several supplements.